Windows

General discussion

Spammers Using my Exchange 5.5 Server

I am running an Exchange 5.5 server with POP3 users. In the outgoing mail queue in IMS I keep getting outgoing messages with blank originators addressed to email destinations such as travelagentpromos4.net, e-marketingsolutions.com, bestoffers.net...All sounding like they are some type of spam going out. I have tightened the security on the box well however they continue to send the emails. I have reviewed my IMS logs which I cranked up to maximum since i noticed this and it appears that they actually authenticate in and send messages right from port 25. I have run tests on port 25 to very that authentication is required and that relay is also prohibited. Authentication was required in order to send mail and relay was prohibited. In IMS properties I have selected accept hosts only with Authentication, clients can only submit if homed on this server and clients can only submit if auth account matches subbmission address. What else can I do? They continue to send messages and I am worried I will be blacklisted soon. Any help is appreciated!!!ThanksJM

Make sure there aren't any machines with adware sending things through your server, this will defeat the relaying since it is originating on your network.

One way to test your exchagne server is at www.ordb.org this will allow you to have an open relay test performed on the hostname or IP that you give. while your there, make sure that IP isn't already in their DB.

Open your Exchange administrator and find the Internet Mail Service. Double click, find and click the 'Routing' tab. Then click on the button "Routing Restrictions" It is down towards the bottom of the window. When it opens, make certain that there is a check mark in these boxes....Hosts and Clients that successfully authenticateANDHosts and Clients with these IP addressesMicrosoft does not tell you that you can select these options and leave the large boxes blank. After you close out all of your windows, stop and start your Microsoft Exchange Internet Mail Service.

Open your Exchange administrator and find the Internet Mail Service. Double click, find and click the 'Routing' tab. Then click on the button "Routing Restrictions" It is down towards the bottom of the window. When it opens, make certain that there is a check mark in these boxes....Hosts and Clients that successfully authenticateANDHosts and Clients with these IP addressesMicrosoft does not tell you that you can select these options and leave the large boxes blank. After you close out all of your windows, stop and start your Microsoft Exchange Internet Mail Service.

Open your Exchange administrator and find the Internet Mail Service. Double click, find and click the 'Routing' tab. Then click on the button "Routing Restrictions" It is down towards the bottom of the window. When it opens, make certain that there is a check mark in these boxes....Hosts and Clients that successfully authenticateANDHosts and Clients with these IP addressesMicrosoft does not tell you that you can select these options and leave the large boxes blank. After you close out all of your windows, stop and start your Microsoft Exchange Internet Mail Service.

I had a customer that was having the same problem you explained above. After doing quite a bit of research, I found that doing the above settings will stop the relay. This was done for my customer and they are currently not having any more problems.

Start or search

Create a new discussion

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

Post type

Subject title

Topic Tags

Select up to 3 tags (1 tag required)

Cloud

Piracy

Security

Apple

Microsoft

IT Employment

Google

Open Source

Mobility

Social Enterprise

Community

Smartphones

Operating Systems

Windows

Mac

Malware

Tablets

Networking

Browser

Hardware

Software

Web Developerment

Linux

Off Topic

Message Body

Track this discussion and email me when there are updates

Please note: Do not post advertisements, offensive material, profanity, or personal attacks. Please remember to be considerate of other members. If you're new to the TechRepublic Forums, please read our TechRepublic Forums FAQ. All submitted content is subject to our Terms Of Use.